After police searched Hoffman's apartment during their investigation into his death, they found two diaries. These journals allegedly contain details of his love life, including his feelings for a mystery woman.

In the diaries, Hoffman reportedly wrote about being "caught in between" the mother of his three children, O'Donnell, and a woman he had recently met. While it was believed that O'Donnell split from Hoffman due to his ongoing drug addiction, the actor suggested the mystery woman might also have had something to do with the breakup.

Hoffman, 46, also detailed his struggle with drugs and alcohol as well as his efforts to overcome his addictions with unsuccessful Narcotics Anonymous meetings. He even wrote about drug deals he made along the way. The Capote star described how he was troubled by "demons" with entries that often became incoherent as if he was high while writing them.

An insider told NBC that it seemed Hoffman wrote part of the entries while he was in rehab last year. Some of the writings are clear and "soul-searching. But there is also a fair amount of rambling that doesn't make sense."

Another source told The Daily Mail that Hoffman wrote of how he felt "ashamed that he was going out and hanging out and drinking" after being sober for 23 years.

Hoffman's "stream of consciousness was difficult to follow," a third source added. "In one line he refers to 'Frank who always owes money' and on the same page he writes about a 15-year-old girl from Texas.'"